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Method for producing an output voltage and assembly for performing the method

A technology of output voltage and input voltage, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, conversion of AC power input to AC power output, etc. minor issues

Active Publication Date: 2014-01-08
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] ·In the case of current reduction, when f 0 N , the operation will obviously limit the characteristic value of the inverter, so that the possible application range will be sharply reduced
For example, it is not possible to perform a 4-quadrant drive where M=M is ​​required over the entire range of torque of the machine N

Method used

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  • Method for producing an output voltage and assembly for performing the method
  • Method for producing an output voltage and assembly for performing the method
  • Method for producing an output voltage and assembly for performing the method

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Embodiment Construction

[0077] Different adjustment and control methods for M2C have been widely known, as for example in M. Hagiwara, H. Akagi, "PWM control and experiment of modular multilevel converters", Power Electronics Specialists Conference (PESC) 2008, PESC2008, IEEE, Page154- As described in 161, this method has the effect of influencing energy fluctuations in the sub-module capacitors. In addition to the implemented control or regulation method, the operating mode of the power converter also has a decisive influence on energy fluctuations. For this reason, the basic correlation of energy fluctuations is exemplarily explained for one method, and the voltage U d Impact.

[0078] in figure 1 The structure of the cells arranged in the series circuit or the structure of the so-called sub-module of M2C is shown in. Other circuit variants are also possible.

[0079] figure 2 The circuit structure for generating the three-phase voltage system M2C on the terminals U, V, W is given by way of example. ...

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Abstract

The invention, which relates to a method for producing an output voltage by means of an M2C and an assembly for performing the method, is based on the aim of specifying a solution by means of which the capacitor and semiconductor complexity and costs associated therewith are reduced at a given load current, the open-loop and closed-loop control complexity is simplified for the operating range of ?102, and the losses in the converter are reduced. Said aim is achieved by the method in that, in order to reduce the capacitor complexity in the converter, the input voltage (Ud) is controlled in an open-loop or closed-loop manner according to the angular frequency (?0) in the range between a lower angular frequency (?1), which is greater than or equal to the zero frequency (?0), and an angular frequency (?2) in such a way that the input voltage increases with increasing frequency.

Description

Technical field [0001] The present invention relates to a method of generating a frequency-variable (frequenzveraenderlich) output voltage u by means of a modular multilevel power converter (Multilevel-Stromrichter) (M2C) a Method, wherein the power converter (Stromrichter) is switched on and off by the input voltage U d Generate a first angular frequency ω approximated by discrete voltage levels 0 Sine-shaped AC voltage, the first angular frequency is at zero frequency ω 0, min And the second angular frequency ω 0 , max between. [0002] The invention also relates to the implementation of a modular multilevel power converter (M2C) from the input voltage U d Generate variable frequency output voltage u a In the device of the method, in a multi-level power converter, in order to generate an output voltage, a branch composed of a series circuit of a plurality of sub-modules is arranged. Background technique [0003] The multi-level power converter can generate a voltage with very sma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02P27/14
CPCH02P27/14H02M7/483H02M2001/0003H02M2007/4835H02M1/0003H02M7/4835H02M5/451H02M3/158
Inventor 汉斯·贝恩克劳斯特芬·贝尔纳特阿尔布雷希特·根西奥尔延斯·韦伯
Owner SIEMENS AG